What I did: I installed Agenda on my MacBook Air, which I use for travels, and activated the syncing via iCloud.
What happened: The notes arrived OK, but all my categories got doubled. Every category now exists 2x, one with the projects, the other empty.
What I expected: I expected the categories to only arrive 1x, as in the original Agenda on my iMac.
What I tried: I tried to get rid of the »doubles« by renaming them first (to »abc« or so) and then deleting them. Which worked for some, but not for others. One I got deleted, but it popped up again almost immediately.
Things that might be helpful to know (Agenda version, OS and model, etc): Agenda 7.0 (91), macOS Sierra 10.12.6